<!DOCTYPE html>
<html>

<head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.bundle.min.js"></script> </head>

<body>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text" id="basic-addon1">@</span>
        </div>
        <input type="text" class="form-control" placeholder="Username"
            aria-label="Username" aria-describedby="basic-addon1"> </div>
    <div class="input-group mb-3">
        <input type="text" class="form-control" placeholder="Recipient's username"
            aria-label="Recipient's username" aria-describedby="basic-addon2">
        <div class="input-group-append">
            <span class="input-group-text" id="basic-addon2">@example.com</span>
        </div>
    </div>
    <label for="basic-url">Your vanity URL</label>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text" id="basic-addon3">https://example.com/users/</span>
        </div>
        <input type="text" class="form-control" id="basic-url" aria-describedby="basic-addon3"> </div>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text">$</span>
        </div>
        <input type="text" class="form-control" aria-label="Amount (to the nearest dollar)">
        <div class="input-group-append">
            <span class="input-group-text">.00</span>
        </div>
    </div>
    <div class="input-group">
        <div class="input-group-prepend">
            <span class="input-group-text">With textarea</span>
        </div>
        <textarea class="form-control" aria-label="With textarea"></textarea> </div>
</body>

</html>